Documents disponibles écrits par cet auteur

Effect of information feedback on bidder behavior in continuous combinatorial auctions / Gediminas Adomavicius in Management science, Vol. 58 N° 4 (Avril 2012) 

Public ISBD [article]  in Management science > Vol. 58 N° 4 (Avril 2012) . - pp. 811-830 Titre : Effect of information feedback on bidder behavior in continuous combinatorial auctions Type de document : texte imprimé Auteurs : Gediminas Adomavicius, Auteur ; Shawn P. Clark, Auteur ; Alok Gupta, Auteur Année de publication : 2012 Article en page(s) : pp. 811-830 Note générale : Management Langues : Anglais (eng) Mots-clés : Auctions  Combinatorial  auctions  Information  feedback  Bidder  behavior  Experimental  economics Résumé : Combinatorial auctions—in which bidders can bid on combinations of goods—can increase the economic efficiency of a trade when goods have complementarities. Recent theoretical developments have lessened the computational complexity of these auctions, but the issue of cognitive complexity remains an unexplored barrier for the online marketplace. This study uses a data-driven approach to explore how bidders react to the complexity in such auctions using three experimental feedback treatments. Using cluster analyses of the bids and the clicks generated by bidders, we find three stable bidder strategies across the three treatments. Further, these strategies are robust for separate experiments using a different setup. We also benchmark the continuous auctions against an iterative form of combinatorial auction—the combinatorial clock auction. The enumeration of the bidding strategies across different types of feedback, along with the analysis of their economic implications, is offered to help practitioners design better combinatorial auction environments. DEWEY : 658 ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/content/58/4/811.abstract [article] Effect of information feedback on bidder behavior in continuous combinatorial auctions [texte imprimé] / Gediminas Adomavicius, Auteur ; Shawn P. Clark, Auteur ; Alok Gupta, Auteur . - 2012 . - pp. 811-830. Management Langues : Anglais (eng) in Management science > Vol. 58 N° 4 (Avril 2012) . - pp. 811-830 Mots-clés : Auctions  Combinatorial  auctions  Information  feedback  Bidder  behavior  Experimental  economics Résumé : Combinatorial auctions—in which bidders can bid on combinations of goods—can increase the economic efficiency of a trade when goods have complementarities. Recent theoretical developments have lessened the computational complexity of these auctions, but the issue of cognitive complexity remains an unexplored barrier for the online marketplace. This study uses a data-driven approach to explore how bidders react to the complexity in such auctions using three experimental feedback treatments. Using cluster analyses of the bids and the clicks generated by bidders, we find three stable bidder strategies across the three treatments. Further, these strategies are robust for separate experiments using a different setup. We also benchmark the continuous auctions against an iterative form of combinatorial auction—the combinatorial clock auction. The enumeration of the bidding strategies across different types of feedback, along with the analysis of their economic implications, is offered to help practitioners design better combinatorial auction environments. DEWEY : 658 ISSN : 0025-1909 En ligne : http://mansci.journal.informs.org/content/58/4/811.abstract

Turbulent flow characteristics in circular corrugated culverts at mild slopes / Shawn P. Clark in Journal of hydraulic research, Vol. 49 N° 5 (Septembre/Octobre 2011) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 49 N° 5 (Septembre/Octobre 2011) . - pp. 676-684 Titre : Turbulent flow characteristics in circular corrugated culverts at mild slopes Type de document : texte imprimé Auteurs : Shawn P. Clark, Auteur ; Nicholas Kehler, Auteur Année de publication : 2011 Article en page(s) : pp. 676-684 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Culvert  Fish  passage  Secondary  current  Shear  stress  Turbulence  Velocity  distribution Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : Anthropogenic barriers to fish passage at stream crossings are an important issue in North America. Environmental regulations impose velocity restrictions on culvert flow, which may be overly simplistic. A series of laboratory experiments were conducted in a corrugated metal pipe culvert at three mild slopes. Acoustic Doppler velocimeters were used to measure velocity and turbulence quantities. A significant percentage of the cross-sectional flow area was found to have a streamwise velocity lower than the mean bulk velocity. Secondary currents were measured and are believed to contribute to the strong velocity dip at the water surface and the non-uniform shape of the boundary shear stress distribution. A modified version of the log law is proposed to estimate water velocities within the fully-developed flow region. Results may be of interest to hydraulic engineers and regulators involved with fish passage issues at stream crossings as also for calibration and verification of numerical culvert models. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.596399 [article] Turbulent flow characteristics in circular corrugated culverts at mild slopes [texte imprimé] / Shawn P. Clark, Auteur ; Nicholas Kehler, Auteur . - 2011 . - pp. 676-684. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 N° 5 (Septembre/Octobre 2011) . - pp. 676-684 Mots-clés : Culvert  Fish  passage  Secondary  current  Shear  stress  Turbulence  Velocity  distribution Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : Anthropogenic barriers to fish passage at stream crossings are an important issue in North America. Environmental regulations impose velocity restrictions on culvert flow, which may be overly simplistic. A series of laboratory experiments were conducted in a corrugated metal pipe culvert at three mild slopes. Acoustic Doppler velocimeters were used to measure velocity and turbulence quantities. A significant percentage of the cross-sectional flow area was found to have a streamwise velocity lower than the mean bulk velocity. Secondary currents were measured and are believed to contribute to the strong velocity dip at the water surface and the non-uniform shape of the boundary shear stress distribution. A modified version of the log law is proposed to estimate water velocities within the fully-developed flow region. Results may be of interest to hydraulic engineers and regulators involved with fish passage issues at stream crossings as also for calibration and verification of numerical culvert models. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.596399